Factory steel roll bar

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stretch
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Re: Factory steel roll bar

Post by stretch »

I couldn't tell you Matt. He frequents this parish. Maybe if you line his palms with gold.😊
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Re: Factory steel roll bar

Post by hot66 »

any of you tried the custom drag racing chassis builders ? This will be a piece of p155 for them

https://www.robinsonracecars.com/
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Re: Factory steel roll bar

Post by Hugo 356 »

matteo68 wrote: Thu Aug 04, 2022 9:04 am
stretch wrote:Mine is a Barrie Martin produced bar. Dimensions taken from his own original factory safari rally car.
Dave Is Barrie still trading / producing these as his website doesn’t seem to be working? If he is, can you send me his contact details please?
Barrie is putting this 904 rep together at the mo so is still trading. Unusually gonna get a four-cam rather than flat-6. There are contact details on
http://www.technic-motorsport.com/ but I don't know if they're any good

The build thread is worth a gander
https://forum.porsche356registry.org/vi ... =4&t=47060
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Hugo 356
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Re: Factory steel roll bar

Post by Hugo 356 »

The thread does say "Barrie is still building 904s. He has 6 in the build queue after mine. But he stopped taking orders for new builds a year or two ago. Barrie is 71 and it he completes on average one car every12 - 18 months."
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matteo68
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Factory steel roll bar

Post by matteo68 »

Hugo 356 wrote: There are contact details on
http://www.technic-motorsport.com/ but I don't know if they're any good

The email address provided doesn’t work unfortunately.
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Re: Factory steel roll bar

Post by MarkIII »

matteo68 wrote: Wed Aug 03, 2022 9:01 pm Thanks, that’s really helpful to hear from someone with first-hand experience of the Carpoint roll bar. I’ll search for your thread but how was it in terms of quality and ease of installation?
Quality is very good,
In terms of installation, it went in pretty smoothly by all accounts, and was removed a couple of times during the shell restoration phase
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Re: Factory steel roll bar

Post by matteo68 »

That’s good to hear. £566 for one on Carpoint’s eBay page doesn’t seem too bad to me for a quality item.

No diagonal support bar on yours then?
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Re: Factory steel roll bar

Post by MarkIII »

matteo68 wrote: Thu Aug 04, 2022 9:32 pm That’s good to hear. £566 for one on Carpoint’s eBay page doesn’t seem too bad to me for a quality item.

No diagonal support bar on yours then?
I removed it, many 68 race cars never had the diagnol, my car was build to emulate a well known 68 t/r racer.....
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Re: Factory steel roll bar

Post by matteo68 »

Ok. Did you have to cut it off or was it designed to be removed or reversed as required?
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Re: Factory steel roll bar

Post by rich73 »

Hi Matt,
I need to get a roll bar too but have put it on the back burner for now to concentrate on the shell. I did some research and found the tube outside diameter was 35mm and the Centreline radius(CLR)of the bends was 270mm. I contacted a few roll cage manufactures and tube benders and most couldn't do the required CLR. T&T Tubecraft could do the bends but it was going to be £300 just for supply of the main hoop with bends. I'll try find some time next week to see if I can get the bends done at a more sensible price.
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Re: Factory steel roll bar

Post by Lightweight_911 »

.

Actually the diameter of the original CDS tubing was 40mm rather than 35mm ...

.
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Re: Factory steel roll bar

Post by BILLY BEAN »

Lightweight_911 wrote: Sat Aug 06, 2022 10:55 am .

Actually the diameter of the original CDS tubing was 40mm rather than 35mm ...

.
Agree with Andy: 40mm O.D. drawn tube not the cheaper welded.
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Re: Factory steel roll bar

Post by 911hillclimber »

Got to be worth using the right steel, cds.
Is 40mm a standard size?
I think 41.3 mm is.
A lot of CDS are old imperial sizes
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Re: Factory steel roll bar

Post by MikeB »

I know that the RAC MSA used to specify CDS for roll bars, and probably still do, so if nothing else it means should there be any future competition use you have the basis of an acceptable structure, that any additional tubing can be added to.
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Re: Factory steel roll bar

Post by 911hillclimber »

True.
The Motorsport uk (RAC/MSA) stipulate the tube dia and the tube wall thickness in order to comply with the regs known as the ROPS, roll over protection system.

The main hoop in question here I think is 40mm minimum and certainly CDS.
Details on the Motorsport UK web site under Saftey. Section K.

Just looked in my 2020 edition of the Blue Book, forgotten how badly written it is. Tube dia is 40mm min.

The main hoops in my 911 and my LOLA are 41.4mm dia cds.
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